fix: correct public API snapshots with CustomHookExecutor changes

The previous commit had outdated snapshot files. This commit includes the correct
API surface with:
- CustomHookExecutor property on TestContext
- SetHookExecutor() method on TestRegisteredContext

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

TUnit.PublicAPI/Tests.Assertions_Library_Has_No_API_Changes.DotNet9_0.verified.txt

@@ -5,14 +5,6 @@ namespace
     {
         public static void Fail(string reason) { }
         public static  Multiple() { }
-        public static void NotNull<T>([.] T? value, [.("value")] string? expression = null)
-            where T :  class { }
-        public static void NotNull<T>([.] T? value, [.("value")] string? expression = null)
-            where T :  struct { }
-        public static void Null<T>(T? value, [.("value")] string? expression = null)
-            where T :  class { }
-        public static void Null<T>(T? value, [.("value")] string? expression = null)
-            where T :  struct { }
         public static . That( action, [.("action")] string? expression = null) { }
         public static .<object?> That(.IEnumerable value, [.("value")] string? expression = null) { }
         public static . That(<.> action, [.("action")] string? expression = null) { }

TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.DotNet9_0.verified.txt

@@ -1268,6 +1268,7 @@ namespace
         public .CancellationToken CancellationToken { get; set; }
         public .ClassHookContext ClassContext { get; }
         public int CurrentRetryAttempt { get; }
+        public .? CustomHookExecutor { get; set; }
         public .<.TestDetails> Dependencies { get; }
         public ? DisplayNameFormatter { get; set; }
         public .TestContextEvents Events { get; }
@@ -1471,6 +1472,7 @@ namespace
         public .TestContext TestContext { get; }
         public .TestDetails TestDetails { get; }
         public string TestName { get; }
+        public void SetHookExecutor(. executor) { }
         public void SetParallelLimiter(. parallelLimit) { }
         public void SetTestExecutor(. executor) { }
     }